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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '703f43183b349d9554ae76357b0a64d4522ef53c3e6b137f4196ba3b02242af6' 
  AND token = 'XG1g43BZTGRqJ61b34AOmXjqdLSH+cy66pvxWB5OLPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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