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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e413f37a2c4d2ab9c5a3d8ca6e8d294e0e877b577464291b6d02b26fcfbb0448' 
  AND token = 'YJvJJLEYw6y/4HO5kCyzy/BKt8zl6z0vgs0IHIxMs98=' 
  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"
    }
  }
}