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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eb7055acd676e9a2b59c42c64bf155f1dca0fddbf600f34498a08444c057ae4' 
  AND token = 'lPvyKS209xDXwztDxnYTgbUwm4odBQ3Quhsx1s7L1Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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