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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afbd040026d86ee561680629f13d9034525339632befb4f5d9e7158653b8a71f' 
  AND token = '89ovIt7FU7OdjI0mMmrvexrSEn33XCrV946nf2GTIcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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