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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c61d01c603811b7a2caa7572bd709073f8312e831449dbd0b30b8d82de440b7' 
  AND token = '10HR0ROQvsDmVVWiuqQpgBXjXXVe34YCZsfm8jM9j14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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