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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07d6603de2dd0c8207c0c669e0edd7a003ed0d7fd3d0ec71721e2483e4031bf3' 
  AND token = 'YxGx8dCGn5ZMV1X7Ech+urmKBrF9dIB/wOXAxqCoyKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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