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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '949774a28c1c91501423dd00637eb0872db4782e9d729d1674d314c1a094ccab' 
  AND token = 'u9r0aQVddmT1b/FCtVxrwrd5ylI72juCdI3OORhdFqk=' 
  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"
    }
  }
}