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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3a30a8802c49c90e10d9156bad45e190151d5c59cdd98b0a6306847e8f5df12' 
  AND token = 'NnzgoWca8/GcPjkV8UYT5UksXPkF7atINIMbH+YKcmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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