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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24ef754cdacece527597f520d8d327373d9369d1998e463ab17fd0b80e8d4364' 
  AND token = 'r+r0z/R8lBJ5iCfbOWIRFQaQ6MdSEugyZT8VpNPArzY=' 
  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"
    }
  }
}