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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc65579e646fe6b1b10ca1a30e58e9274e45569a58e307b6c5c4ce9761b429b1' 
  AND token = 'Ama0X+klBd4UavH6uHg97RZyd1IZwN0ORhAIHRBlfhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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