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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6eafa638b27e424b8aa1d433beb28c919306622c074628a76c5bebc0762d0e9' 
  AND token = '26pKa6xYdlRFHgx8/0q6PHCr80XHjxea747D75u2a7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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