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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54cbdaa3a9c7dc88bc702f8810fa0cbf29a9f71e3e325c70e1a4b35a551a75f7' 
  AND token = '7DvEgfR3HV3q2SQy61kS9ALZ+M+VFeyUze51s68BJDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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