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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '352664ea9b3c95626c7707247c06729bdd6e7b9256c02a3781de509919c4f136' 
  AND token = '4fhP9iMvSt9tSZj8j/OTc0TBdTU4EWPtQ4M0O98etEk=' 
  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"
    }
  }
}