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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c194cef3a5b80941c98c0cb68fdf2b72a1927d6b1ea96e7ff3b90620112a3e9' 
  AND token = 'oSNmjQwnwr/9wYhMHSY2olRvHNxGtLpq8uS3bl4Af8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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