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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3609405e60091be91ee278ee495e11ed3961ae5de38078f80d03fac33e4bc396' 
  AND token = 'XN9stXJmXAYHfOyThoacaDYv9xD2/cmQ+Dwl73I99zs=' 
  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"
    }
  }
}