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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb76695ad3e757c6ee1a82eaba3d0c31d84b31794f784a28698256c06649d889' 
  AND token = 'JNX9coTMb3mZhIMQpOb6le+7AWRjDYNVBwi2kAB0Q/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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