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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa5c0591e4eb676008c1411e6f50d3f9d56b50c2156b9bf20588bf77e2ad1064' 
  AND token = 'dL6G2J+hT0fy+xmob4jDqJtMWyVp3+iSanmoXL1N1B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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