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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dccc0d28a06aa83bbfb586aa66309081f6b19d66af84801715e2d26a6d2bbc2' 
  AND token = 'VhpJrA3mJ4JDods3ryITKO4A0ThWZOk0jNTC2hXb1kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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