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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f70ed4b287923fa07101797a00a26aa5881d41ec09c84cbf46940d6d73531ef4' 
  AND token = 'KFQHd3uCJ33IvUG/NRLNkC/rlJ6X5eHlIOsVLW06Hg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}