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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfcfefa7b431c3ce4303e27392d18137bbfadd1fed0cdd438f6347ef038654a2' 
  AND token = 'Opnol1DQbjrBK2mPWqC62J+f1fPYok3iOo4H7wXc0L4=' 
  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"
    }
  }
}