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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '047436e0ce434ea3cfed877e1324dcc6c03333a3918f8ba2ec26b3c490a30f9b' 
  AND token = 'b8YnqxJWoNBURx4io2Xc0QL+2Nlv7rHEcyTx7h0+spw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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