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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cf4a2aa1b4783077ee5bfcb4db83df749e00529738d0d0ec8ab2bb60d3a954b' 
  AND token = 's/5zjZCVHaW1wT3PvNtpnipawWQjM+S8Q9ZvOb3F49M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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