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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26a1106edc18b59dedea31d54151d9f38bbee2fcd40d8abd9af5a69214a525b3' 
  AND token = 'HNtgGD9Ar2m+kA15VL8AAUc7Fk+rVxbwppn/1WSMGho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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