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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc775ee363be978ae5287f3a81b4656f6d783962352b0d2b7e7c557efe3443ba' 
  AND token = 'wAC36wLlj97cD1xKWnCvm/3FrfPhUse7mPWrkK8gy+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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