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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d941b54298d30b3c82a9bcfb9a35e7fcd3ccbb6606439db076b95a47e0e847' 
  AND token = 'FAfGryRMoSi8muAj1+4Y2QqWz8wEd9mNpRNcTSQWNGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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