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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcc0427838f2b8362cde12ffee78f961620dfc46dba116b0bde087deeb1ecc27' 
  AND token = 'wy+HYMO/LDZScL0zzxgZ9w5U1Q8CNAZ2OWW1v5ckwXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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