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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20a6b7c20870f8f95fee5e9c7ce96f02292fb79e61abc2d1fc760f3b05b0f3d5' 
  AND token = 'HX8bZWERoZboumIXTcvwvG4e4bs5To+GjrYRq7+Cld8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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