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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb2a6710f4cf1548b7b8d2f4c56bb1159e1492ba248e42c355e8671a17eb22ab' 
  AND token = 'Ehfy6Vzf6jqMHLR52jk+MX6C4uYMlfshqwnrW5TFivc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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