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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1895ae11b1ffede70634ba8c4e1c8e7f313f87216c5b035cb202fcc6c2704ac7' 
  AND token = 'eu9JV9nU312Ql3d0xE76RtCX7XNIq9bKDZf+1UUSQAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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