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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1ba4b4822bcb4126da9db089c54fc77e59619f800117f40bfc8a0cd15d8d251' 
  AND token = '9AS1vLseqgjfTb7TAT//fA/3oQhDAv901QxuJLoh2vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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