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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ef76fd86694ab048e545775cd37bfedb8ba0ec67200e8777cd96a9a782554c0' 
  AND token = 'zdZv+F/vSbbEfUmSE24Z2O/1k+m6kP+C348cvuAILBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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