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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc832c1c93b31c34afd5c36571d123bf815b1d9b7ed4a74c04c7b28251f6e5e' 
  AND token = 'hzrKA9WrltKPSnsUWWKJ7gvJMRy11+UTL55l3Zv3iPM=' 
  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"
    }
  }
}