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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b4242e885ec48090372f536c966a5b363c396b59792cc9c24f1ca8d5c6753de' 
  AND token = 'T6d0RKOwSjB0gGRtqhVw8i9uSlKJ1QdIKbB3T6RcfXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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