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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b29082305487a1a56c3d5f9451bbf6dc813474a72bb0f15b6adc2a922663696' 
  AND token = 'hiMIsyItPlwEbQmtTX2E42HDslHLH/9FoVJSzZ5AUa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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