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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '455c067fc34213502c24b728e7cb87bc63ddea772e08c989b58730076439e26d' 
  AND token = 'MmPsmEyWSwTk4eY/P4xFy5LOoZzGsw7LTdHKnVX3HLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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