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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ea5c16447ef0c679e4f93942569a6ce7cbd3ae66d798cb591acb29fa7a44913' 
  AND token = 'oQb1G6F+KMBa5G67desuLt7EM0B8ZL85/WRwmW73rBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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