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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7fa9ade9c85c13276366ae4643530c3498dcce896e5a7115c999a789291ec9d' 
  AND token = 'xPW2j6qLXEx4nw98MF14sxmuMwjYK5t5IIgwEI4Ft4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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