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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad251d3197302e4885a996602c2a1f4aefc72b30b8e48462e54cd0cc2a6764f4' 
  AND token = 'p1Gg30AUUgKmhgybW/x4+8NI9rOmRDhFQwrid2f1ws0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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