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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebf33c1093543aba3b4f86546a42c737bb13b889a764ab128f4b41e4364238ba' 
  AND token = 'It2qitWuf/iRxEEwKhxL6NIrOFvcG5Jb7KJT6DTJo8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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