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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cd700bc9ef5c6a1281b3027eb11c18b8a1e732bf647b9441f4e78a61e206a18' 
  AND token = '2GUU1CL0uU0atq57I5VFIVoAkXE5coNDlEoLM9S9yj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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