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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '333ad6153c46ac3c88d0f697cb5461f1003a53a7beb9ff25751e2c0aba37830f' 
  AND token = 'rA4ioAnOfvP9VS6SyeBwxF/e4d/eX3K6wWv0VdSCtAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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