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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4183f504f5a417e2b14bbccd668426aabe97acd64327f5520cd934a5dfd4d224' 
  AND token = '+9L96lBz2ssxOzo1SfOtfyFLVNbT55mLlgzZ14bQz8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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