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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f79ce2871c0aee6e1fee8d3baba56deabc567f5b90990d405d64469ee969e58' 
  AND token = '5M3XJW9oBuag9pay05SOZTD1wokaGjF10nEi853qorg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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