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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0c58e26ffada29957b3cdcde8e488eb97286a0bc3e60d66330a4e323fb3aecb' 
  AND token = '7SSyWnKTxK+Ail3xWU0E6TYm0lxwnDH/8wtGPcbj0Qg=' 
  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"
    }
  }
}