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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f4d262afed7b41fcf8ad6c160f1fe230f7f4f062c151e3269b2d1adc76e584c' 
  AND token = 'mp9msWJuFEDn1Pz7nrodkSmPpGo0WKVo+SRFk5IRyCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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