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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c06fb37f3befec6dda60843a2ab308c5b3dea4b0de9b429c5f29ad51b5e6fbe' 
  AND token = 'qqT5sJe9+5eTA+w+GxYCYDU2su2TlPeR6D2sp/RdPKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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