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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da8e38c18970cd485421cf77092fb9c5827912bc343201d94331e270b94421b7' 
  AND token = 'fSLgfAvK14NeZgopg0hhc+8Tv+BbJJGmW8ovTXapEjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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