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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61fb9db2b7ac672e7f9c17c8453852bce8c28cd297ecfc1e172aa2d0b66798e7' 
  AND token = '7KJ52H/1Wl5ivNQ0Nr4Mo+IRGbA+HuGo0blIHaw10o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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