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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '484e030de81ef9af975307d9bd40a8d2b65f5e07339334e993164ef4b474814c' 
  AND token = 'YbtAxyelvEIACXM4flgUWzG2AwyGkiMNAbwUGT3G1Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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