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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33f20222cc92bfb620f965c682796f6e274b92673cd76aa98c6f6e7ca5774cee' 
  AND token = 'rGt8Pws07vXUis624AtuSLwbPGdAJ/9KECOEZ7EPUZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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