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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d3f3644d2d30c5b76e3b0a4ec14d8a4d8f916a139c9998abebd55510c49d69e' 
  AND token = 'ctYMBoZht8ODKWC/iBNz0JOoODzpL3Qb1X/dnRpzRVs=' 
  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"
    }
  }
}