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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '072e7cf1341226e09c42bfb051a061c11eb5cd6b87dddb257adeb3a324093986' 
  AND token = '71XiMg5AQ1IenR7CGtedTzpWkkkx8CIXcPB34/R8a3A=' 
  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"
    }
  }
}