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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be21704709b0e13a69acd884c3b78e04ceca6f84d298eec44d039eaf7ec20acf' 
  AND token = 'RdXFPTisd2rZv+8+tv4MRovF8MDYqlwNmVSl6AW94gU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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