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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cba79fc75d6e2611c9336268127c36a7a1c8e1ee81731a67b72be3e498c8fad6' 
  AND token = 'MW3NHrRXTAAdgOep0qalQmmvAXoPVNX65dcgutvuB60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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