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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dceacfc21cea12a5a6f265339d6e5777f7828990d6e9185d5419f9dbaab6751' 
  AND token = 'EXErtis5+FlJPgVA5m5uH5IWyJnhY0dCcd+Edynbp18=' 
  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"
    }
  }
}