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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e986f00620101cfdef88d48a6a6b8a19e459e701d4135ce5348fc8cf82f565b1' 
  AND token = '8eWsBm1qoadU6Ob2IHezHv9/ufD/2Dq2wlmzi3tRqHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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