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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3952e375c334d590aa2dc6514fa0b7dc7b11c2e328fb4079e88aa79f453c3edd' 
  AND token = 'rboDNzKZYDuaupdU5FbcE0NG7snhGrctgaZe14ZsSZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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