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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbb40f0f88fa1f1d66e04429ed924be40e5cd5741c97786c55fb54a0382f8356' 
  AND token = 'X0ZoP2poByO3L2Tq4mucOYtP4c1Qwx1y8vzdoXfFPLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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