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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd376260ba95550fd675883e45f0a6d4ed3111e8c8c853a3448c32817c99b063' 
  AND token = '0orFOpXm1zQNI4qP7fCGgh23PSFVU3QMbUCoNrlWtGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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